well its seems like you want to kill your enemy with 1hit in early game weach is immposible, and if you want an op classe who can do a good damage at the early game you can chose monk or mage they are a little op at the early but you should know that to be more powerfull you need to leveling and searching for items who work good with your classes you can visite this site to know what armor and weapon etc........ you want https://pillarsofeternity.gamepedia.com/Item.
if you want to not die at the early game you can take eder and aloth and late game you can play summoner it really helpfull and viable build.